@stencil/router/dist/collection/utils/location-utils.js

import { parsePath, parseQueryString } from './path-utils';
const isAbsolute = (pathname) => {
    return pathname.charAt(0) === '/';
};
export const createKey = (keyLength) => {
    return Math.random().toString(36).substr(2, keyLength);
};
// About 1.5x faster than the two-arg version of Array#splice()
const spliceOne = (list, index) => {
    for (let i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1) {
        list[i] = list[k];
    }
    list.pop();
};
// This implementation is based heavily on node's url.parse
export const resolvePathname = (to, from = '') => {
    let fromParts = from && from.split('/') || [];
    let hasTrailingSlash;
    let up = 0;
    const toParts = to && to.split('/') || [];
    const isToAbs = to && isAbsolute(to);
    const isFromAbs = from && isAbsolute(from);
    const mustEndAbs = isToAbs || isFromAbs;
    if (to && isAbsolute(to)) {
        // to is absolute
        fromParts = toParts;
    }
    else if (toParts.length) {
        // to is relative, drop the filename
        fromParts.pop();
        fromParts = fromParts.concat(toParts);
    }
    if (!fromParts.length) {
        return '/';
    }
    if (fromParts.length) {
        const last = fromParts[fromParts.length - 1];
        hasTrailingSlash = (last === '.' || last === '..' || last === '');
    }
    else {
        hasTrailingSlash = false;
    }
    for (let i = fromParts.length; i >= 0; i--) {
        const part = fromParts[i];
        if (part === '.') {
            spliceOne(fromParts, i);
        }
        else if (part === '..') {
            spliceOne(fromParts, i);
            up++;
        }
        else if (up) {
            spliceOne(fromParts, i);
            up--;
        }
    }
    if (!mustEndAbs) {
        for (; up--; up) {
            fromParts.unshift('..');
        }
    }
    if (mustEndAbs && fromParts[0] !== '' && (!fromParts[0] || !isAbsolute(fromParts[0]))) {
        fromParts.unshift('');
    }
    let result = fromParts.join('/');
    if (hasTrailingSlash && result.substr(-1) !== '/') {
        result += '/';
    }
    return result;
};
export const valueEqual = (a, b) => {
    if (a === b) {
        return true;
    }
    if (a == null || b == null) {
        return false;
    }
    if (Array.isArray(a)) {
        return Array.isArray(b) && a.length === b.length && a.every((item, index) => {
            return valueEqual(item, b[index]);
        });
    }
    const aType = typeof a;
    const bType = typeof b;
    if (aType !== bType) {
        return false;
    }
    if (aType === 'object') {
        const aValue = a.valueOf();
        const bValue = b.valueOf();
        if (aValue !== a || bValue !== b) {
            return valueEqual(aValue, bValue);
        }
        const aKeys = Object.keys(a);
        const bKeys = Object.keys(b);
        if (aKeys.length !== bKeys.length) {
            return false;
        }
        return aKeys.every((key) => {
            return valueEqual(a[key], b[key]);
        });
    }
    return false;
};
export const locationsAreEqual = (a, b) => {
    return a.pathname === b.pathname &&
        a.search === b.search &&
        a.hash === b.hash &&
        a.key === b.key &&
        valueEqual(a.state, b.state);
};
export const createLocation = (path, state, key, currentLocation) => {
    let location;
    if (typeof path === 'string') {
        // Two-arg form: push(path, state)
        location = parsePath(path);
        if (state !== undefined) {
            location.state = state;
        }
    }
    else {
        // One-arg form: push(location)
        location = Object.assign({ pathname: '' }, path);
        if (location.search && location.search.charAt(0) !== '?') {
            location.search = '?' + location.search;
        }
        if (location.hash && location.hash.charAt(0) !== '#') {
            location.hash = '#' + location.hash;
        }
        if (state !== undefined && location.state === undefined) {
            location.state = state;
        }
    }
    try {
        location.pathname = decodeURI(location.pathname);
    }
    catch (e) {
        if (e instanceof URIError) {
            throw new URIError('Pathname "' + location.pathname + '" could not be decoded. ' +
                'This is likely caused by an invalid percent-encoding.');
        }
        else {
            throw e;
        }
    }
    location.key = key;
    if (currentLocation) {
        // Resolve incomplete/relative pathname relative to current location.
        if (!location.pathname) {
            location.pathname = currentLocation.pathname;
        }
        else if (location.pathname.charAt(0) !== '/') {
            location.pathname = resolvePathname(location.pathname, currentLocation.pathname);
        }
    }
    else {
        // When there is no prior location and pathname is empty, set it to /
        if (!location.pathname) {
            location.pathname = '/';
        }
    }
    location.query = parseQueryString(location.search || '');
    return location;
};